Product Overview
Our Grade 8.8 nuts are made from high-quality carbon steel, offering exceptional strength and durability. The Grade 8.8 rating indicates the mechanical performance level of the nut, which is typically used with bolts of the same strength grade, such as Grade 8.8 bolts. Available in sizes ranging from M6 to M24 (1/4″ to 1 1/16″), these nuts are perfect for heavy-duty applications in construction, automotive, machinery, and industrial sectors. Manufactured in China, they provide reliable performance in high-stress environments, ensuring secure connections and long-lasting results.
Technical Specifications
| Material Standard | High Quality Carbon Steel (GB/T 700 Q235 or equivalent) |
| Tensile Strength | ≥800 MPa |
| Yield Strength | ≥640 MPa |
| Hardness Range | HRC 22-32 |
| Surface Treatment | Black Oxide Coating |
| Salt Spray Test | 24-48 hours (Basic rust protection) |
| Available Sizes | In mm:M6, M8, M10, M12, M14, M16, M18, M20, M22, M24.In inches:1/4″, 5/16″, 3/8″, 1/2″, 9/16″, 5/8″, 3/4″, 7/8″, 1″, 1 1/16″. |
8.8 Nut Size Chart
| Metric Size (mm) | Imperial Size (inches) | Internal Diameter | Thread | Standard Thickness |
|---|---|---|---|---|
| M6 | 1/4″ | 6.4 mm | M6 | 4 mm |
| M8 | 5/16″ | 8.4 mm | M8 | 6 mm |
| M10 | 3/8″ | 10.4 mm | M10 | 7 mm |
| M12 | 1/2″ | 12.4 mm | M12 | 8 mm |
| M14 | 9/16″ | 14.4 mm | M14 | 9 mm |
| M16 | 5/8″ | 16.4 mm | M16 | 10 mm |
| M18 | 3/4″ | 18.4 mm | M18 | 11 mm |
| M20 | 7/8″ | 20.4 mm | M20 | 12 mm |
| M22 | 1″ | 22.4 mm | M22 | 13 mm |
| M24 | 1 1/16″ | 24.4 mm | M24 | 14 mm |
Key Notes:
- Internal Diameter: This is the internal diameter of the nut, suitable for matching with bolts of corresponding sizes.
- Thread: Represents the matching standard between bolts and nuts, with metric threads denoted as M series.
- Standard Thickness: The standard thickness of the nut, ensuring the fastening strength and reliability of the connection.
Application Scenarios
Grade 8.8 nuts are widely used in industries that require strong and reliable connections. They are commonly found in construction projects, machinery, automotive, railways, shipping, and the oil and gas sector, especially in heavy-load, vibration, and corrosion-prone environments. Whether in structural steel frames, engine components, or power equipment and offshore platforms, these nuts provide excellent strength and durability, ensuring the stability and safety of industrial equipment, heavy machinery, and transportation tools:
Steel Construction
Fastening structural steel components, beams, and plates
Machinery Assembly
Heavy-duty equipment, press machines, and engine frames
Automotive Industry
Vehicle chassis, engines, and suspension systems
Power & Energy Sector
Wind, solar, and mechanical mounting systems
General Industrial Use
Anywhere requiring high tensile strength and reliability
Product Quality Certificate
Quality Certification Standards
Product quality is our priority, validated by Hebei Provincial Fastener Product Quality Supervision and Inspection Center. This authoritative provincial institution has rigorously tested our screws, nuts and bolts for material, hardness, strength, precision and corrosion resistance—all meeting or exceeding industry standards. This certification guarantees reliable performance for your projects.
Product Packaging Specifications
Comprehensive Packaging Solutions
- Inner Packaging: 25kg per woven bag or small box, PE bag lining
- Outer Packaging: 900kg wooden pallets or fumigated plywood cases
- Custom Packaging: Logo boxes, barcode stickers available on request
Manufacturing Facility Overview
Advanced Manufacturing Facility
Our 5,000㎡ workshop features clear zones for raw materials, processing, testing and finished goods. Equipped with over 50 advanced CNC machines and cold headers, we achieve ±0.01mm precision from wire to finished fasteners. 20+ skilled staff monitor production, while a dedicated lab with tensile testers and spectrometers ensures strict quality checks—rejecting all substandard products.
Customer Service Policy
Return & Exchange Policy
We stand behind our high-quality fasteners. For defective products, returns are accepted within 7 days of receipt (unused, in original packaging, with defect evidence); we refund product cost (shipping non-refundable). Exchanges for wrong specs or minor defects (unused) are allowed within 7 days, with customer covering shipping. Not accepted: customer-caused errors, used/damaged products, requests after 7 days.
Frequently Asked Questions
What is the difference between Grade 8.8 and Grade 10.9 nuts?
Grade 8.8 nuts have tensile strength ≥800MPa, suitable for general industrial applications; Grade 10.9 has higher strength (≥1000MPa), ideal for high-load or vibration environments.
How effective is Black Oxide coating for rust protection?
Black Oxide provides basic rust protection, suitable for dry or mildly humid environments. For higher corrosion resistance, we recommend zinc plating or Dacromet coating.
What is the minimum order quantity (MOQ)?
Standard sizes have MOQ of 1,000 pieces, with sample testing support. Special sizes are negotiable.
Do you provide other certifications (ISO, DIN)?
Yes, we can provide products complying with ISO 898-2, DIN 934, and other international standards.
Contact Us
Need more information about our Grade 8.8 Nuts or have special requirements? Our technical sales team is ready to serve you across Southeast Asia.
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